<template>
  <div class="home-page">
    <div class="banner">
      <div class="container">
        <h1 class="logo-font">conduit</h1>
        <p>A place to share your knowledge.</p>
      </div>
    </div>
    <div class="container page">
      <div class="row">
        <div class="col-md-9">
          <div class="feed-toggle">
            <ul class="nav nav-pills outline-active">
              <li class="nav-item"
                  v-if="user">
                <nuxt-link class="nav-link"
                           :class="{active: tab==='your_feed'}"
                           :to="{name:'home',query:{tab:'your_feed'}}"
                           exact>Your Feed</nuxt-link>
              </li>
              <li class="nav-item">
                <!-- <a class="nav-link active" href="">Global Feed</a> -->
                <nuxt-link class="nav-link"
                           :class="{active: tab==='global_feed'}"
                           :to="{name:'home'}"
                           exact>Global Feed</nuxt-link>
              </li>
              <li class="nav-item"
                  v-if="tag">
                <nuxt-link class="nav-link"
                           :class="{active: tab==='tab'}"
                           :to="{name:'home',query:{tab:'tab'}}"
                           exact># {{ tag }}</nuxt-link>
              </li>
            </ul>
          </div>

          <div class="article-preview"
               v-for="article in articles"
               :key="article.slug">
            <div class="article-meta">
              <nuxt-link :to="{name: 'profile', params: {username:article.author.username}}">
                <img :src="article.author.image" />
              </nuxt-link>
              <!-- <a href="profile.html"><img src="http://i.imgur.com/Qr71crq.jpg" /></a> -->
              <div class="info">
                <!-- <a href="" class="author">Eric Simons</a> -->
                <nuxt-link class="author"
                           :to="{name: 'profile', params: {username:article.author.username}}">
                  {{article.author.username}}
                </nuxt-link>
                <span class="date">{{article.createdAt | date('MMM DD, YYYY')}}</span>
              </div>
              <button class="btn btn-outline-primary btn-sm pull-xs-right"
                      :class="{active:article.favorited}"
                      @click="onFavorite(article)"
                      :disabled="article.favoriteDisabled">
                <i class="ion-heart"></i> {{article.favoritesCount}}
              </button>
            </div>
            <nuxt-link :to="{name:'article',params:{slug:article.slug}}"
                       class="preview-link">
              <h1>{{article.title}}</h1>
              <p>{{article.description}}</p>
              <span>Read more ...</span>
            </nuxt-link>
          </div>
          <nav>
            <ul class="pagination">
              <li class="page-item"
                  v-for="item in totalPage"
                  :key="item"
                  :class="{active: item===page}">
                <nuxt-link :to="{name:'home',query:{page:item,tag:$route.query.tag,tab:tab}}"
                           class="page-link">{{item}}</nuxt-link>
              </li>
            </ul>
          </nav>
        </div>

        <div class="col-md-3">
          <div class="sidebar">
            <p>Popular Tags</p>

            <div class="tag-list">
              <nuxt-link v-for="item in tags"
                         :key="item"
                         :to="{name: 'home',query:{tag:item,tab:'tab'}}"
                         class="tag-pill tag-default">{{item}}</nuxt-link>
            </div>
          </div>
        </div>

      </div>
    </div>

  </div>
</template>

<script>
import {
  getArticles,
  getYourFeedArticles,
  addFavorite,
  deleteFavorite,
} from "@/api/article";
import { getTags } from "@/api/tag";
import { mapState } from "vuex";
export default {
  name: "homeIndex",
  async asyncData({ query }) {
    const page = Number.parseInt(query.page || 1);
    const limit = 20;
    const tab = query.tab || "global_feed";
    const tag = query.tag;

    const loadArticles =
      tab === "your_feed" ? getYourFeedArticles : getArticles;
    const [articleRes, tagRes] = await Promise.all([
      loadArticles({
        limit,
        offset: (page - 1) * limit,
        tag,
      }),
      getTags(),
    ]);
    const { articles, articlesCount } = articleRes.data;
    const { tags } = tagRes.data;
    articles.forEach((article) => (article.favoriteDisabled = false));
    return {
      articles,
      articlesCount,
      limit,
      page,
      tags,
      tag,
      tab,
    };
  },
  head() {
    return {
      title: `RealWorld`,
    };
  },
  watchQuery: ["page", "tag", "tab"],
  computed: {
    ...mapState(["user"]),
    totalPage() {
      return Math.ceil(this.articlesCount / this.limit);
    },
  },
  methods: {
    async onFavorite(article) {
      article.favoriteDisabled = true;
      if (article.favorited) {
        await deleteFavorite(article.slug);
        article.favorited = false;
        article.favoritesCount -= 1;
      } else {
        await addFavorite(article.slug);
        article.favorited = true;
        article.favoritesCount += 1;
      }
      article.favoriteDisabled = false;
    },
  },
};
</script>

<style lang="sass" scoped>
</style>
